Comment by nkoren

I was working with a company trying to run a render farm. They were based in an old concrete warehouse with high ceilings, but as the company expanded, they ran out of floor space and decided to create a mezzanine floor. So now you had two very low-ceilinged floors instead. And you know what held up the mezzanine floor? Batteries. Huge banks of chained-together automotive batteries. Of course there were conventional Uninterruptible Power Supplies attached to every computer, but those wouldn't survive the entire blackout, so the car batteries and inverters and whatnot were upstream from those.

Looking back at it, it's hard to believe that nobody died...